netdev - Re: [PATCH net] ipv4/route: do not check saddr dev if iif is LOOPBACK

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Message-ID: <f44d9f26-046d-38a2-13aa-d25b92419d11@gmail.com>
Date:   Thu, 1 Aug 2019 13:51:25 -0600
From:   David Ahern <dsahern@...il.com>
To:     Hangbin Liu <liuhangbin@...il.com>, netdev@...r.kernel.org
Cc:     Stefano Brivio <sbrivio@...hat.com>,
        Marcelo Ricardo Leitner <mleitner@...hat.com>,
        David Ahern <dsahern@...il.com>,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH net] ipv4/route: do not check saddr dev if iif is
 LOOPBACK_IFINDEX

On 8/1/19 2:29 AM, Hangbin Liu wrote:
> Jianlin reported a bug that for IPv4, ip route get from src_addr would fail
> if src_addr is not an address on local system.
> 
> \# ip route get 1.1.1.1 from 2.2.2.2
> RTNETLINK answers: Invalid argument

so this is a forwarding lookup in which case iif should be set. Based on
the above 'route get' inet_rtm_getroute is doing a lookup as if it is
locally generated traffic.